import * as fs from 'fs';

fs.writeFile('./bbb.txt', 'hello world', {
    encoding: 'utf-8',
    flag: 'a+' // 使⽤追加模式
   }, (err) => {
    console.log('写入文件结果:', err);
   });
   const writeStream = fs.createWriteStream('./ccc.txt',
    { flags: 'a' }); // 追加写⼊

    writeStream.on('open', (fd) => {
        console.log('文件被打开',fd);
    });
    writeStream.write('coderwhy');
    writeStream.write('aaaa');
    writeStream.write('bbbb', (err) => {
    console.log("写入完成:", err);
    });
    writeStream.on('finish', () => {
        console.log('写入完成了');
       });
       writeStream.on('close', () => {
        console.log('文件被关闭~');
       });
       writeStream.end('哈哈哈哈');